# o1-pro-2025-03-19 — API, pricing & specs via nRouter

> o1-pro-2025-03-19 is available through nRouter, the managed LLM gateway: one OpenAI-compatible API key, 0% token markup (exact provider list pricing), 0% platform fee, built-in guardrails, and per-request cost tracking.

## What it is

Compute-intensive version of o1 dated March 19, 2025, using additional reasoning compute for high-difficulty analytical and mathematical queries.

Source: https://platform.openai.com/docs/models/o1-pro.md

## Facts

- Maker: OpenAI
- Released: 2025-03-19
- Served on: OpenAI

## nRouter list pricing (exact provider rates, 0% markup)

- Input: $150 per 1M tokens
- Output: $600 per 1M tokens

Settled at the exact provider list price above. nRouter adds no per-token markup and charges a 0% platform fee (see https://nrouter.ai/pricing).

## Use it

```python
from openai import OpenAI

client = OpenAI(
    base_url="https://api.nrouter.ai/v1",
    api_key="sk-nrouter-YOUR_KEY",  # create one at https://nrouter.ai/signup
)

response = client.chat.completions.create(
    model="openai/o1-pro-2025-03-19",
    messages=[{"role": "user", "content": "Hello"}],
)
```

Model page: https://nrouter.ai/models/o1-pro-2025-03-19
Full nRouter index for AI engines: https://nrouter.ai/llms.txt
Docs: https://nrouter.ai/docs